Assigkob of one-half to



IINITED STATES PATENT OFFICE,

`MARSHALL GARDNER, OF AURORA, ILLINOIS, ASSIGNOR OF ONE-HALF 'IO J AMESSTONE, OE SAME PLACE.

BOX OF PLASTIC MATERl/L.

SPECIFICATIN forming part of`Letters Patent No. 383,175, datedv May 22.1883,

Application tiled April 11, i887. Serial No. 28h/itil. (Model.)

To @ZZ whom it may concern;

Be it known that I, MAnsHALL GARDNER, of Aurora, county of Kane, andState of Illinois, have invented certain Improvements in Boxes Made ofPlastic Material, of which the following is a specification. y

My said invention relates to boxes of plastic material, consisting of abottom and four sides; and my invention will be hereinafter fully deroscribed with reference to the accompanying drawings, in which- Figure lrepresents a sheet or plate ot' the material having the requisitequalities out of which abox is to be formed; and Fig. 2, a perspectiveView of the same after the sides C shall have been raised into verticalpositions and their adjoining side edges fitted together around thecentral part, D, which serves as the bottom of the box. 2c: The sheets Aare to be of uniform thickness and ofthe shape shown in Fig. 1, thereheilig an arm, C, for each of the four sides ot' the central piece, D,and each arm C is provided on both of its side edges with necks ortenons B, which are so arranged upon each side of the arms with respectto the necks upon the adjacent arms that every neck, when the four armsare brought into vertical position, will enter a recess between twoadjacent necks, as 3C shown in Fig. 2. Vhen the four sides shall havebeen so fitted together, then, by any suitable apparatus operated byhydraulic or other power, the sides and bottom, including the cornersand joints, are to be compressed to- -gether from without against aproper former placed within the box. The necks or tenons need not belonger than the thickness of the sheet or blank, and the object informing them and the recesses for them is to increase thecontact-surfaces of the material and render 4o more effectual thewelding of the parts of the box together by means of the pressure einnployed, and by reason of the eXertion of the pressure the sides andbottom of the box will be made thinner and the tenons shorter, and thejoinings of the parts will be almost obliterated, and no otherfastenings or means of finishing will be necessary, unless it should bethe mere drying of the box or the vulcanizing of the same incase itshould be made of soft 5o rubber.

It will be seen that the sides ol the box are connect-cd at their edgesby a. welded mortise andtenon joint.

Of course the box will beairand Water tight.

The entire blank A, with its necks and recesses, may be cut by a simpledie at one 0perntion, and the welding by pressure may be done atanother.

What I claim as my invention, and desire to 6o secure by Letters Patent,is

A box of plastic material, consisting ofa bottom and four sides, thesides being connected to each other at their edges by welded mortiseandtenon joints, substantially as described MARSHALL GARDN

